From 87671375108625bb7f8a09f0809a369d460ebe43 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Sat, 11 May 2019 23:14:45 +0300 Subject: net: dsa: Initialize DSA_SKB_CB(skb)->deferred_xmit variable The sk_buff control block can have any contents on xmit put there by the stack, so initialization is mandatory, since we are checking its value after the actual DSA xmit (the tagger may have changed it). The DSA_SKB_ZERO() macro could have been used for this purpose, but: - Zeroizing a 48-byte memory region in the hotpath is best avoided. - It would have triggered a warning with newer compilers since __dsa_skb_cb contains a structure within a structure, and the {0} initializer was incorrect for that purpose. So simply remove the DSA_SKB_ZERO() macro and initialize the deferred_xmit variable by hand (which should be done for all further dsa_skb_cb variables which need initialization - currently none - to avoid the performance penalty). Fixes: 97a69a0dea9a ("net: dsa: Add support for deferred xmit") Signed-off-by: Vladimir Oltean Signed-off-by: David S. Miller --- net/dsa/slave.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net/dsa') diff --git a/net/dsa/slave.c b/net/dsa/slave.c index fe7b6a62e8f1..9892ca1f6859 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -463,6 +463,8 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev) s->tx_bytes += skb->len; u64_stats_update_end(&s->syncp); + DSA_SKB_CB(skb)->deferred_xmit = false; + /* Identify PTP protocol packets, clone them, and pass them to the * switch driver */ -- cgit